There was a time, and I don't know if they're still doing it in cheap potting mixes or not, that instead of Perlite in potting mixes, companies were using tiny Styrofoam beads. The beads would work their way to the top of a container over time. I wonder if that's what gave some folks the idea that it floats to the top?
I used to pick up one of the white bits of a potting soil before I bought it and squeezing it to see if it squished or crumbled before buying.
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